A military bunker complex located on Rauöy island in the Oslofjord, Norway. The Oslofjord region was a strategically vital area heavily fortified during the Second World War by German forces as part of the Atlantic Wall coastal defense system, and later maintained by Norwegian forces during the Cold War. The specific designation 'MKB' (likely an abbreviation for a Norwegian military term such as 'Marinekommandantbunker' or similar) suggests this was a standardized coastal or harbor defense position.
While the provided search results discuss general nuclear shelter and fallout protection concepts, they do not contain specific historical or technical data confirming the exact purpose, construction date, or armament of this particular site. Its current state and accessibility are not detailed in the available information.